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Thanks. We've got a standard system in place. We recently had the CH pump replaced, which they did without draining the system, but resulted in another radiator deciding not to heat up. We've tried balancing the system again & bleeding everything, but to no avail. It feels like there must either be air pockets or sludge holding back performance, so we'll get someone round to have a look and hose through as you suggest.
Have you come across these guys https://www.powderflush.co.uk/ ?
user20714
Right so a power flush won’t work on microbore. Folks might say it will but from experience it’s a waste of time. You could drain the system and take the radiators off too that you feel need a flush and take them out the back and hose them, that’s a trick we do sometimes too but if so bad it’s a change rads
If radiators aren’t heating it’ll 100 percent be a blockage, look for a manifold that’s where we always start and if worst comes to worst repipe the ones that are shit.
A modern combi is pressured so batters the water round the system, or do you have a standard system?